GOODWILL AND INTANGIBLE ASSETS - Summary of Intangible Assets by Intangible Asset Type (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Intangible assets	$ 35,130	$ 33,665
Less accumulated amortization	(26,961)	(25,969)
Intangible assets, net	8,169	7,696
Covenants Not-to-Compete
Finite-Lived Intangible Assets [Line Items]
Intangible assets	17,941	17,594
Less accumulated amortization	(16,627)	(16,402)
Intangible assets, net	1,314	1,192
Client Lists
Finite-Lived Intangible Assets [Line Items]
Intangible assets	17,189	16,071
Less accumulated amortization	(10,334)	(9,567)
Intangible assets, net	$ 6,855	$ 6,504